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Your computer feeling a lot slower lately? That new program you installed not working? Can't convert a specific file? Looking to buy a new hard drive or dvd writer? Would like some recommendations? Firewalls, latest threats and general P2P security issues are here also.

I have bought a new fan (Corsair SP120 Quiet at 1450 rpm) to replace a slightly broken, but very loud and clicking fan in a push and pull configuration on my Cooler Master Hyper 212X. My question is, taking into consideration that now I am using two different fans, the Corsair and one of the original Cooler Master fan (I think the rpm is around 2000 or more, I think).

Which one in your opinion should be the push and which one the pull?

Should I plug them both into the same mobo power connctor (CPU Fan), and if so, using a splitter connector, one end with 4 and the other with 3 pins, which one should be plugged into the 4 pins?

I think KingJohn means that you should connect the fan's connectors into their own 3-pin or 4-pin fan header on your motherboard, IF you have two or more pins on the motherboard for fans, like this:
If you use the 4-pin fan header on your motherboard the fans will be regulated by the motherboard according to the temperature. If its cold the fan goes slow and if its warm the fan goes fast.

Then I would say it should be OK to connect both fans to the same pin fan header on your motherboard (if your motherboard is not a extreme budget one). First I would check the motherboard specs for how much power the header can deliver (voltage(V) x current(A) = watts(W)).